beta -blocker

beta -blocker
in full beta-adrenergic blocking agent

Any of a class of synthetic drugs used to treat a wide range of diseases and conditions of the sympathetic nervous system (see autonomic nervous system).

Stimulation by epinephrine of beta-adrenergic receptors, which are predominately found in the heart but are also present in vascular and other smooth muscle, results in excitation of the sympathetic nervous system. By preventing that excitation, beta-blockers are useful in controlling anxiety, hypertension, and a variety of heart conditions (see heart disease). They reduce the risk of a second heart attack.

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Universalium. 2010.

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  • beta blocker — noun any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta adrenergic receptors of the autonomic nervous system • Syn: ↑beta blocking agent, ↑beta adrenergic blocker,… …   Useful english dictionary

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  • beta-blocker — ˈ ̷ ̷  ̷ ̷ ˈ ̷ ̷  ̷ ̷ noun : any of a group of drugs (as propranolol) that combine with and block the activity of a beta receptor so as to decrease the heart rate and force of contractions and to lower high blood pressure and that are used… …   Useful english dictionary

  • beta-blocker — UK [ˈbiːtə ˌblɒkə(r)] / US [ˈbeɪtə ˌblɒkər] / US [ˈbɪtə ˌblɑkər] noun [countable] Word forms beta blocker : singular beta blocker plural beta blockers medical a drug that makes your heart work more slowly, used for treating high blood pressure …   English dictionary

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